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https://issues.apache.org/jira/browse/SOLR-5351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13925680#comment-13925680
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Tommaso Teofili commented on SOLR-5351:
---------------------------------------

the problem to me is not (only) on the Solr side, but I think Lucene's 
MoreLikeThis should support multiple fields instead of just one, e.g. adding a 
new method like
{code}
Query like(Reader r, String... fieldNames) throws IOException
{code} 

> More Like This Handler uses only first field in mlt.fl when using stream.body
> -----------------------------------------------------------------------------
>
>                 Key: SOLR-5351
>                 URL: https://issues.apache.org/jira/browse/SOLR-5351
>             Project: Solr
>          Issue Type: Bug
>          Components: MoreLikeThis
>    Affects Versions: 4.4
>         Environment: Linux,Windows
>            Reporter: Zygmunt Wiercioch
>            Priority: Minor
>
> The documentation at: http://wiki.apache.org/solr/MoreLikeThisHandler 
> indicates that one can use multiple fields for similarity in mlt.fl:
> http://localhost:8983/solr/mlt?stream.body=electronics%20memory&mlt.fl=manu,cat&mlt.interestingTerms=list&mlt.mintf=0
> In trying this, only one field is used. 
> Looking at the code, it only looks at the firs field:
>  public DocListAndSet getMoreLikeThis( Reader reader, int start, int rows, 
> List<Query> filters, List<InterestingTerm> terms, int flags ) throws 
> IOException
>     {
>       // analyzing with the first field: previous (stupid) behavior
>       rawMLTQuery = mlt.like(reader, mlt.getFieldNames()[0]); 



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